[time-nuts] The home time-lab

Scott McGrath scmcgrath at gmail.com
Mon Jul 25 11:28:16 EDT 2016

Charles is correct and most data centers and metrology laboratories operate from power produced by large versions of these systems i.e. From 50KW to megawatts generally backed by one or more generators to carry facility when utility power is not available 

Content by Scott
Typos by Siri

> On Jul 25, 2016, at 8:39 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> Chris wrote:
>> I've never thought UPS were a good idea for anything but a computer
>> that needs to shut down gracefully.   For your use you need something
>> that cleans up the AC mains power.
> A proper "online" (or "double conversion") UPS does just that.  It always provides cleanly-generated sine-wave power from a DC-AC converter.  Most will even deliver crystal-controlled power (i.e., non-synchronous with the AC line) in several frequency increments, if you desire, as well as a choice of regulated output voltages.  (For obvious reasons, they are usually operated synchronously.)
> They are *much* more effective than ferroresonant supplies at removing glitches from the mains supply.
> You must be referring to "offline" backup supplies.
> Best regards,
> Charles
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